Fluidized bed with heated liners and a method for its use
AssigneeUnion Carbide Chemicals and Plastics Company Inc.
InventorRobert N. Flagella
Life of this patent
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Abstract
An improved fluidized bed reactor and a method for its use characterized by a variable thickness inert liner surrounding the fluidized bed reaction zone. Such liner generates heat that is transferred to the reaction zone. The heat is generated in the inert liner by passing an electrical current through the inert liner. The inert liner is thicker at the top than at the bottom and therefore more heat is generated at the bottom of the reaction zone than the top of the reaction zone due to the increased resistance of the thinner portions of the inert liner.
Claims23
A heated bed reactor comprising:
- (a) means defining a fluidized bed reaction zone capable of confining fluidized bed particles;
- (b) a liner surrounding the reaction zone and being in contact with the contents of the reaction zone and inert such that it at least does not adversely affect the reaction, the liner being composed of an electrically conductive material that rises in temperature as an electric current is passed therethrough;
- (c) means connected to said insert liner for supplying an electrical current to the inert liner thereby causing the inert liner to generate heat that is transferred to reaction zone;
- and
- (d) a fluidizing means for providing fluidization in the reaction zone.
A method of heating a fluidized bed reactio zone comprising:
- (a) surrounding the fluidized bed reaction zone with a liner which is in contact with the contents of the reaction zone and inert such that it at least does not adversely affect the reaction, said inert liner comprising an electrically conductive material that rises in temperature as an electric current is passed therethrough;
- (b) supplying an electrical current to the inert liner thereby causing the inert liner to generate heat that is transferred to the reaction zone.
A method for the production of high purity polycrystalline silicon by pyrolyzing silane containing gas in a fluidied bed reaction zone, comprising:
- (a) introducing silane containing gas in a fluidized bed of silicon seed particles for heterogeneously decomposing said silane containing gas, the fluidized bed of silicon particles being surrounded by a liner which is in contact with the contents of the reaction zone and being inert such that it at least does not adversely effect the reaction and comprising an electrically conductive material that rises in temperature as an electrical current is passed therethrough;
- and
- (b) supplying an electrical current to the inert liner thereby causing the inert liner to generate heat that is transferred to the reaction zone.
Dependencies are inferred from the claim text.